Drill



No. 327.315. Patented Sept. 29, 1885.

wzlnesses Inawflbr gfifiuihardsow 15 I J. Qvx MM N PETERS Phum-uxhu nher. Wnhin tun. 0.6.

To all whom it may concern..-

UNITED STATES PATENT OFFICE.

GEORGE RICHARDSON, OF BRIDGEPORT, CONNECTICUT.

DRILL.

SPECIFICATION forming part of Letters Patent No. 327,315, datedSeptember 29, 1885.

Application filed May 11, 1885. (No model.)

Be it known that I, GEORGE RICHARDSON, a citizen of the United States,residing at Bridgeport, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements inDrills; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to certain novel and useful improvements in drillsfor boring purposes, and has for its object to provide a device of thisdescription which shall be especially adapted for tapping pipes in whichthere is a pressure of any gas or liquid; and with these ends in view myinvention consists in the details of construction and combination ofelements hereinafter fully explained, and then specifically designatedby the claims.

In order that those skilled in the art to which my invention appertainsmay fully understand its construction,l will proceed to describe thesame in detail, referring by letter to the accompanying drawing, formingapart of this specification, which is a central vertical section of adrill and shank embodying my improvements.

A is the drill-shank,having in its lower extremitya recess, B,which actsas a seat for the drill-cutter C.

As shown,the drill-cutter is held in position within its seat in theshank by means of a threaded rod, D, which passes through the shank andengages with the cutter, a wrench head, G, being secured to or formedwith the upper end of the rod by which the latter is operated.

I preferably thread the upper end of the shank externally and attachthereto an internally-threaded cap, E,adapted to accommodate the rod,and within this cap place a packgas from escaping through the shank. New

drill-cutters are to be used at each operation of the drill, as afterdrilling the cutter drops into the main.

Of course it will be understood that myimproved drill is designed foruse only in connection with any suitable tapping mechanism, and hence adetachable drill-cutter affords a great advantage.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a drill, the hollow shank having in the interior thereof a rodthreaded at the lower end and provided with a wrench-head at the other,in combination with the cutterpoint having a threaded opening andadapted to be held in position within a recess in the end of the shankby engagement with the rod, whereby a ready detachment of said point maybe effected, substantially as set forth.

2. The hollow drill-shank made in two parts and containing apacking-ring,in combination with the cutter-point adapted to be heldwithin the extremity of the shank by the threaded rod, whose upper endis provided with a wrench-head, as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE RICHARDSON.

Witnesses:

S. S. WILLIAMSON, H. T. SHEL'roN, Jr.

